package typeinfo;

/**
 * @author Mr.Sun
 * @date 2022年04月10日 22:05
 *
 * instanceof与Class等价性
 */
class Base {}
class Derived extends Base {}

public class FamilyVsExactType {
    static void test(Object x) {
        System.out.println("Testing x of type " + x.getClass());
        System.out.println("x instanceof Base " + (x instanceof Base));
        System.out.println("x instanceof Derived "+ (x instanceof Derived));
        System.out.println("Base.isInstance(x) "+ Base.class.isInstance(x));
        System.out.println("Derived.isInstance(x) " +
                Derived.class.isInstance(x));
        System.out.println("x.getClass() == Base.class " +
                (x.getClass() == Base.class));
        System.out.println("x.getClass() == Derived.class " +
                (x.getClass() == Derived.class));
        System.out.println("x.getClass().equals(Base.class)) "+
                (x.getClass().equals(Base.class)));
        System.out.println("x.getClass().equals(Derived.class)) " +
                (x.getClass().equals(Derived.class)));
    }

    public static void main(String[] args) {
        test(new Base());
        test(new Derived());
    }
}/* output:
Testing x of type class typeinfo.Base
x instanceof Base true
x instanceof Derived false
Base.isInstance(x) true
Derived.isInstance(x) false
x.getClass() == Base.class true
x.getClass() == Derived.class false
x.getClass().equals(Base.class)) true
x.getClass().equals(Derived.class)) false
Testing x of type class typeinfo.Derived
x instanceof Base true
x instanceof Derived true
Base.isInstance(x) true
Derived.isInstance(x) true
x.getClass() == Base.class false
x.getClass() == Derived.class true
x.getClass().equals(Base.class)) false
x.getClass().equals(Derived.class)) true
*/
